diff options
Diffstat (limited to 'config/kernel-spinlock.m4')
| -rw-r--r-- | config/kernel-spinlock.m4 | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/config/kernel-spinlock.m4 b/config/kernel-spinlock.m4 new file mode 100644 index 000000000..136262d0e --- /dev/null +++ b/config/kernel-spinlock.m4 @@ -0,0 +1,24 @@ +dnl # +dnl # 2.6.36 API change, +dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to +dnl # a spinlock_t to improve the fastpath performance. +dnl # +AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [ + AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/sched.h> + #include <linux/fs_struct.h> + ],[ + static struct fs_struct fs; + spin_lock_init(&fs.lock); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1, + [struct fs_struct uses spinlock_t]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) |